package com.heima.interceptor;

import com.heima.context.BaseContext;
import com.heima.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author ljk74
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        String token = "mytoken";
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if ("app_token".equals(cookie.getName())) {
                    token = cookie.getValue();
                    break;
                }
            }
        }
        //2.校验令牌
        try {
            log.debug("开始校验");
            Claims claims = JwtUtil.parseJWT(token);
            Integer id = (Integer) claims.get("id");
            log.info("当前员工ID:{}", id);
            //存入局部线程变量
            BaseContext.setThreadLocal(id);
            //放行
            return true;
        } catch (Exception ex) {
            log.error("jwt校验失败：{}", ex.getMessage());
            //不通过，返回401
            response.setStatus(401);
            return false;
        }
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //用完之后，移除线程局部变量
        BaseContext.remove();
    }
}
